活性污泥中功能性菌群抗盐度冲击性能研究

利用批量实验研究了活性污泥在受到不同盐度冲击时,其硝化功能、反硝化功能以及生物除磷功能所受到的影响。实验结果表明,活性污泥中亚硝酸菌在氯化钠浓度为10 g/L的环境中,其硝化功能受到86%的的抑制作用;硝酸菌对盐度比亚硝酸菌更敏感,氯化钠浓度为5 g/L时已受到较强的抑制。氯化钠浓度达到50 g/L时,反硝化菌受到46%的抑制作用,反硝化菌对盐度的敏感性比硝化菌低得多。聚磷菌对盐度也很敏感,在氯化钠浓度为20 g/L的环境中,聚磷菌厌氧阶段释磷受到52%的抑制作用;而氯化钠浓度为5 g/L时,好氧阶段吸磷已受到41%的抑制作用。

Effect of salinity shock on specific microorganisms in conventional activated sludge

The effects of salt contents on the nitrifiers, denitrifiers and phosphate accumulating microorganisms (PAO) in the conventional activated sludge were studied by batch experiments. The results indicate that the inhibition coefficient is 0.86 for nitrosomonas at the salt content of 10 g/L. Nitrobacter, which is inhibited at the salt content of 5 g/L, seems to be more sensitive to high salinity than nitrosomonas. The denitrifiers possess a better salt tolerance capability than the nitrifiers. At the salt content of 50 g/L the inhibition coefficient is 0.46. PAO is also sensitive to high salinity.When the salt content is up to 20 g/L,the inhibition coefficient is 0.52 for phosphate release under anaerobic conditions. When PAO is subjected to shock loads of 5 g/L salt content, the inhibition coefficient is 0.41 for phosphate uptake under aerobic conditions.